She was separated from her 22-month-old daughter Gabriella and taken to an unknown jail in Kerman province – where she was placed in solitary confinement.

Mrs Ratcliffe’s British husband, Richard who lives in Hampshire, chose to publicise his wife’s plight on the 37th day of her incarceration, after struggling to get information from the Iranian authorities. The move was against Foreign Office advice.

I think she was just passing through at the wrong time. It’s no more than thatRichard Ratcliffe

At the time, he told Telegraph Women: “It’s all just crazy. I don’t understand how this can be happening. That a young mum and baby can be treated as some national security threat is absurd.”

He had no idea why Nazanin, who works as a programme manager for the Thomson-Reuters Foundation - the charitable arm of the news agency - had been detained.

"It's clearly all nonsense," he says. “I think she was just passing through at the wrong time. It’s no more than that."

Mr Ratcliffe has now confirmed that his wife was been moved to a difference location, 600 miles south of the Iranian capital: “Nazanin telephoned her family saying she is being moved into a group cell. I think there’s probably less space but at least there is more company.”

Nazanin Zaghari-Ratcliffe with her husband Richard Ratcliffe and their daughter Gabriella

Mr Ratcliffe had previously told the Telegraph that he feared for his wife’s mental health in solitary:

“I think psychologically she will struggle. It’s very hard for her to be away from her baby, and know what her family are going through. She’s strong but she’s a very gregarious person. She gets a lot of energy from being with people. The hardest part will be being alone. The authorities are just leaving her there because they can.”

A petition, started by Mr Ratcliffe and calling on David Cameron to intervene to have his wife freed, currently has more than 575, 000 signatures. He delivered it to Downing Street yesterday and intends to send another to the Iranian leader Ali Khamenai.

Mrs Ratcliffe has not been charged with any offence, nor has she been allowed a lawyer.

In a phone conversation with her parents, she said that her case relates to “national security”.